module.exports = function(playerAction){

    //电脑随机生成 3 个
var random = Math.random() * 3;//生成 （0，3）之间的随机数
if(random <1 ){
    var computerAction = 'rock'
}
else if(random >2 ){
    var computerAction = 'scissor'
}else{
    var computerAction = 'paper'
}
console.log('我出了' + computerAction)

//比较
if(computerAction ===playerAction)
{
    console.log('平局');
    return 0
}else if(computerAction ==='rock'&&playerAction ==='paper'||
(computerAction ==='scissor'&&playerAction ==='rock') ||(computerAction ==='paper'&&playerAction ==='scissor')){
    console.log('你赢了');
    return -1
}else{
    console.log('你输了');
    return 1
}
}